Malicious PDF — malware analysis report

Static analysis result for SHA-256 599b075d61fc0104…

MALICIOUS

PDF

80.8 KB Created: 2021-05-18 23:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 224c47fe90b2bbfec864492bf31ba8fa SHA-1: 38d7f893bbf9bfaf7075bfbc744a7e3c0c801824 SHA-256: 599b075d61fc0104bdc7811608bbd8c56ab5ca9d6324e7f3285403d25eb24e06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains a large number of external links, many of which are hosted on S3 buckets and Weebly, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=how+to+make+pencil+art+in+photoshop PDF link annotation
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/228d20.pdfIn PDF document text
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/2683859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/regovadeje/8643609045.pdfIn PDF document text
    • http://zelogano.epizy.com/java_arraylist_iterator_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681a280c-d446-406d-9813-045ea1aadb57/62339033969.pdfIn PDF document text
    • http://begokev.epizy.com/stihl_ms250_price_new.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/36179617567.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/bluestacks_3_offline_installer_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/blocky_cars_online_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba01cd3a-7499-45a4-9c1d-5a890b051187/kokeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a8b77b-dac6-4d11-a264-9c669d31a496/levijopokeramejug.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/1._4_exercises_algebra_1_answers.pdfIn PDF document text
    • http://titoxixeze.epizy.com/ecology_and_environment_book_by_pd_sharma_free_download.pdfIn PDF document text
    • http://sejonigimanam.epizy.com/92141279842.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/47674851457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6866b17-098c-42ca-951f-fe4b374c0d02/67636361428.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/11015070864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b19bc06-ed09-41e7-94ef-971e543438ef/what_does_a_void_check_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/how_to_pair_shoei_neotec_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/xidiz.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/bamudafamoba.pdfIn PDF document text
    • http://puwegobatove.epizy.com/atonia_uterina_signos_y_sintomas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 5080 bytes
SHA-256: f2c141e54f0b27da45b5d6ab044bafed6a68ab76474b2050b32d8b035ffc6875
font_01_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 10936 bytes
SHA-256: ff6a8d7bc8b5bffc773444f13e9cb31e5beb3575b6aaedbdb27996786c835131
font_02_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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